Marginal Microleakage and Morphological Characteristics of a Solvent-Free One-Step Self-Etch Adhesive (B1SF)

Objective: in recent years, newly developed solvent-free dental adhesives have been introduced. the aim of this study was to evaluate the marginal integrity of a new one-step solvent-free self-etch adhesive and to compare it with a commonly used two-step self-etch adhesive as the gold standard.materials and methods: class v cavities (2×4×1.5 mm) were prepared on the buccal aspects of 28 human premolars. the cervical margins of the cavity prepara-tions were placed 1 mm apical to the cej. clearfil se bond (cseb) (two-step self-etch adhesive) and bond 1sf (b1sf) (one-step self-etch adhesive) were ap-plied to the cavities in groups 1 and 2 (n=14), respectively. then, the specimens were restored with a2 shade of apx composite resin. each group was evaluated for dye penetration under a stereomicroscope at ×32 after 24 hours and 500 rounds of thermocycling. statistical analyses were carried out using mann whitney test (α=0.05). in addition, in each experimental group, two specimens were prepared for analysis under sem.results: there were no significant differences in enamel margin microleakage be-tween the two adhesives used (p=0.24(; whereas, there were significant differenc-es in dentin margin microleakage between cseb and b1sf (p=0.004). dentin microleakage of b1sf was higher than that of cseb.conclusion: results showed that the enamel marginal integrity of b1sf as a new-ly developed one-step solvent-free self-etch adhesive was similar to that of cseb as a commonly used two-step self-etch; however, dentinal sealing of cseb was better than that of b1sf.